Furnace.



A. SGHM' T.

FURNAG.

APPLICATION YILED- JUNE 21, 1909.

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plane indicated bythe vand illustrating the arrangement of the Y.iniettare ramener cierren.

ALOIS SCHMDT, 0F ST. PAUL, MINNESOTA.

remmen.

' 3eieation of Letters Eatent. Pttgnt Jan. i1, i910?.

Apv4 ieation filed June 21, 1909. Serial No. 503, 472.

concern:

Be itlmown that l, Arois SCHMIDT, citizen of ythe UnitedStates, residing at St. Pauhin the county of Ramsey and State of Minnesota, have invented new" and useful Improvements in Furnaces, of which the following is a specification.

My present invention has to do with means the consumption of smoke and other prot` cts of combustion in steam boiler and other furnaces with a view of practically eliminating the emission of smoke and -economizing in theruse of fuell; and its novelty, utility and practical advantages will be fully'understood from the following description and claim when the same are read in connection vwith the drawings, ae-

companying and forming part of this specification, in which: f i

Figure l 1s a front elevation of a steam boiler furnace equipped with my improvements and showing some of the elements Fig. 2 is a longitudi-v with some of the parts partly broken away. section taken in the line '3--3 of Fig. 2,

partly broken away. nal vertical section, in elevation and others Fig. v3 .is a transverse side, ylongitudinally disposed conduits for ejecting the hot returned gases and other products of combustion and the air added to andcommi-ngled therewith into the box over the re bed therein. Fig. 4; is an enlarged detail section taken on line lll of Fig. 2 and showing a portion of the header partly broken away and also showing part i .of lone of the ejecting conduits in plan.

Fig. 5 is a detail view illustrative ofe the manner of connecting` the contiguous 'aids of the sections comprised in each of the said conduits.

Similar letters designate corresponding parts in all of the views of the drawings, referring to which:

A is a steam boiler furnace comprising ,the usual fire-box a, a boiler b having iiues c adapted to receive smoke and other products of combustion from the colnbustion chamber el, and a smoke boX` c, communicating with and adapted to receive smoke and other products of combustion from the forward ends of the flues ofthe boiler. l would` however, have it here' understood that. without'aifecting my invention one or more smoke boxes may be arranged to receive smoke and other products of combustion from the forward ends of the tlues coniprised in a single ,boiler or a multiplicity of boilers.

ln installing' my invention l. provide two conduits B arranged in the side walls lof the ire'box a and iush with the inner sides of said walls. l also provide a transverse receiver C arranged above and connected through one or more ducts f with the smoke boX c, and having an eduction duct g at its middle, ,designed tolead to a smoke stack or uptake, not showai; a fan blower D located at one side of the furnace and designed to be driven by a suitable motor, not shown, through the medium of a belt z., a duct IG communicating with an opening i in one end of the receiver G and leading to the casing y' of the blower D, and having, at an intermediate point of its length, an opening and a hand-operated valve or door l for controlling said opening; and a duct F leading from the blower casing and merging f into branch duets one of which leads to the forward end of one conduit B and the other to the forward end of the other conduit B.

As best shown in Figs. 2 and 3, the conduits B are provided in their inner walls and at intervals of their length with orifices lm., and consequently when the fan blower D is in action and the furnace is in operation, the course of the smoke, hot gases and other products of combustion is as follows: From the fire bed in the tire-box a said products of combustion pass over the bridge wall n, through the combustion chamber d, and then through the boiler tlues c, the smoke box c, the ducts j', the receiver C, the duct E, the

blower casi ng j, the duct F, the branch ducts G, headers order named, and are discharged through the orifices m of the conduits B into the lire-box t above the tire bed therein. From this it follows that the smoke and other products of combustion are repeatedly subjeeted to the action of the fire and consumption thereof is materially promoted; also, that the injection of said products of combustion in a heated state above the fire bed accelerates the combustion of the fuel and the productslast given ott by the same, with the result that all of the heat valuev of the fuel is utilized. y

It will further be manifest from the fore- Going that the fan blower D serves to exhaust th'products of combustion from the G2 and the conduits B, in the or uniform discharge of the hot ducts G. This also contributes receiver C, and to force said products under pressure to the conduits B, and through said conduits into the fire -ybox a, and consequently there is ample draft through the `bed of lire; the said draft being increased 1n a measure by the connection of the ductV g with the smoke stack or uptake through w-hich a certain portion of the products of combustion escape.

The opening' /e controlled by the valve or door Z serves to enable the attendant in charge of mospheric air into the current of products of combustion as is necessary during the operation of the apparatus; it being understood that the atmospheric air admitted as stated, will be commingled with and heated by the hot gases and other roducts of combustion and willl materia ly romote the combustion in the re-box a and) combustion chamber al.

By reference to Figs. 2, 4 and 5, it will be observed that each ofthe conduits B comprises a plurality of, say three, sections p. These sections are preferably of iron, andare joined together in the manner best shown in Fig. 5-that is to say, by arrang-y ing a reduced rear end r of one in a complementary socket s in the forward end of the next section' toward the rear. The headers G2 are similarly connected with the foremost sections p, andfrom this it follows that the sections p and the headers G2 may be expeditiously and easily positioned from the forward end of the furnace and may as readily be removed when necessity demands. It will also be observed by reference to Fig. Qthat each section p is provided in its inner side wall 'L'. e., its wall' nearest the fire-box with a series of discharge apertures or orices m, there being, by preference, three apertures to eachy section p, and the apertures being three inches apart and respectively three inch'eslong by one and one-half inches hi h. These apertures or orifices m are for t e purpose of assuring an equal gases or gases and air commingled therewith from the conduits B throughout the length ofthe conduits andthe length of the tire bed, so as to cause the fuel to burn evenly or uniformly over the whole of the tire bed.'v

It will be observed by reference to Fig. 4 that the header G2 of each conduit B extends forwardly and obliquely outward from the forward section of the conduit at an angle of about 45 degrees; also, that the forward' portion of the header receives vin its up er wall and is thereby connected to the en arged lower end of one of fthe branch materially to tho facility with which the conduits B may be connected with the ducts G. It will also be here noted that the headers G2 extending at an oblique angle to the imperthe apparatus to admit such atforate forward portions of the forward sections p are advantageous since when so disposed the movement of the blast of hot gases or hot gases commingled with air before the same p ass through the orifices m, and in that way tion of the gases and air under pressure over the fire bed. In other words, the obliquely disposed headers G2 discharge the blast of hot gases or hot gases and air against the imperforate forward portions of the forward sections p, whereupon the blast is caused to move in the direction of the length of the conduits B, for the purpose before stated, and yet the progress or force ofthe blastis not materially checked, with the result that the gases or gases and air are forcibly discharged through the orifices m as is desirable.

ald materially in attaining an even distribuheaders change the direction of K The drawing of the products of combustion through a furnace in the manner described maintains a strong draft which prevents in great'measure the lodging of soot in the flues c of the boiler, and hence said lues do not have to be cleared or cleaned at frequent intervals.

At this point I would have it definitely understood that while I prefer to employ a fan blower D of conventional or any other suitable construction for the purpose ascribed to it, I do not desire to be understood as confining myself to any specific means whatsoever for drawing hot gases from the smoke box e, and returning the said gases with or without air tothe tire box, inasmuch as any means consonant with the purpose of my'invention may be employed for the said Purpose the scope of my invention as defined in the claim appended.

With a view of preventing the radiation of heat-from the products of combustion while en route from the smoke box e back tothe fire box a, I prefer to cover the means through which the products of combustion are conducted in whole or part with asbestos, plastic non-heat conducting material, or any otl1e1"non-heat conducting covering, indicated by M and shown in Figs. l and 2.

This provision obviously prevents the dissipation of Yheat from the products of .combustionrand at thesame time lprevents'undue heating of the atmosphere adjacent the without involving departure from' esame lVhile my novel apparatus is designed more particularly for use in coluliination with steam boiler furnaces, t would ha ve it understood thaty the,apparatusJ may he used to advantage as an air blast tor furnaces in brass and iron foundries.

In addition to the practical ad 'antages It,

` forward portions of the said Walls imperferate; said conduits heilig each made u of a hereinbefore ascribed to my novel apparatus, it will be noted that the said apparatus simple and inexpensive in construction and susceptible ot being readily applied to steau-i lioiler furnaces such as at present in use`r and that the apparatus requires out little attention while in operation, and is calculated to last quite as long as the otheappurtenances of a steam boiler furnace.

The construction herein illustrated and described constitutes the liest practical cniliodinient, of in v invention of which l ani cognizant, but it is obvious that in the .tutnre practice of the invention such changes or modifications niay lic niadc as do not involve departure troni 'the scope of inv invention as defined in the claim appended. Havingdescribed in v invention, what claim and desire to secure hy liett'crs-tatA eut, is:

The combination of a ire-box having side walls, 'downwardly extending ducts disposed and having orifices in their in front of the said walls, means intermediwalls of the fire-box walls thatare opposed to the tirefhox and also having the arranged in the said pluralit;rv ot sections having,` reducer rea-r ends` let into sockets in the forward ends of `the adjacent sections,

and headers having reduced rear ends let into .sockets in the torward ends of the forward sections and extendingl through yand projecting forwardly troni the tirst-naiued walls and.'ohliqueljt7 outward troni and opposite the said imperforate portions of' the conduit walls and having openings in their upper walls receiviiug, the lower ends of the said ducts; the said headers being closed at their for ward ends.

ln testimony whereo'iC have hereunto set my hand in presence ot two subscribing witnesses.`

LOIS SCtlittlD'l.

litnesses:

Grenen' h G aan n, ALICE J. Lonnnnn.

Cil 

